In a rabbit population, the allele for black fur (B) is dominant over the allele for white fur (b). Rabbit X has genotype BB, and Rabbit Y has genotype Bb. What are the phenotypes of a homozygous rece

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Question 2

2.1 What is the phenotype of:

• a) Homozygous recessive
  • The homozygous recessive genotype is $bb$. Since 'b' controls white fur, the phenotype is white fur.
  • Answer: $\boxed{\text{White fur}}$
• b) Rabbit Y
  • Rabbit Y has genotype $Bb$. Since 'B' (black fur) is dominant over 'b' (white fur), the phenotype is black fur.
  • Answer: $\boxed{\text{Black fur}}$

2.2 Give the NUMBER only (X, Y or Z) of the rabbit that is/are:

• a) Homozygous
  • Homozygous means having two identical alleles ($BB$ or $bb$).
  • Rabbit X is $BB$ (homozygous dominant).
  • Rabbit Z is $bb$ (homozygous recessive).
  • Answer: $\boxed{\text{X and Z}}$
• b) Homozygous dominant
  • Homozygous dominant means having two dominant alleles ($BB$).
  • Rabbit X is $BB$.
  • Answer: $\boxed{\text{X}}$

2.3 Represent a genetic cross to show the possible phenotypes and genotypes if rabbit X and Y would mate.

• Parental genotypes (P): Rabbit X ($BB$) $\times$ Rabbit Y ($Bb$)

• Gametes from X: $B$, $B$

• Gametes from Y: $B$, $b$

• Punnett Square:

  $$\begin{array}{|c|c|c|} \hline \text{Gametes} & B & b \\ \hline B & BB & Bb \\ \hline B & BB & Bb \\ \hline \end{array}$$

• Possible Genotypes (F1):

  • $BB$ (50%)
  • $Bb$ (50%)
  • Genotypic ratio: $1 BB : 1 Bb$

• Possible Phenotypes (F1):

  • All offspring will have at least one dominant 'B' allele.
  • Therefore, all offspring will have black fur.
  • Phenotypic ratio: $100\%$ Black fur